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Porous core-shell structure negative electrode material, preparation method and battery thereof

A negative electrode material and porous structure technology, applied in the field of porous core-shell structure negative electrode materials and their preparation and batteries, can solve the problems of volume expansion, difficulty in obtaining electric cycle performance of batteries, etc., and achieve good cycle performance

Active Publication Date: 2017-04-05
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect of volume expansion of the existing tin negative electrode materials during the charge and discharge process, which makes it difficult for the obtained battery to obtain better electric cycle performance, and provides a method that can better relieve the negative electrode material during the charge and discharge process. The problem of volume expansion in the battery, thereby obtaining a porous core-shell structure negative electrode material with better electric cycle performance and its preparation method and battery

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  • Porous core-shell structure negative electrode material, preparation method and battery thereof
  • Porous core-shell structure negative electrode material, preparation method and battery thereof
  • Porous core-shell structure negative electrode material, preparation method and battery thereof

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preparation example Construction

[0028] The invention provides a method for preparing a negative electrode material with a porous core-shell structure, wherein the method comprises:

[0029] (1) Disperse calcium carbonate and / or calcium oxalate and at least one carbonaceous material selected from graphite, hard carbon and soft carbon in a solution containing cobalt compounds and tin compounds to prepare a dispersion and introduce a precipitant Carry out precipitation, then carry out solid-liquid separation, obtain the first solid phase;

[0030] (2) dispersing the first solid phase in a solution containing a carbon source material, and then removing the solvent to obtain a second solid phase;

[0031] (3) Under an inert atmosphere, subjecting the second solid phase to pyrolysis treatment.

[0032] According to the present invention, step (1) disperses calcium carbonate and / or calcium oxalate and at least one carbonaceous material selected from graphite, hard carbon and soft carbon in a solution containing a ...

Embodiment 1

[0072] This example is used to illustrate the negative electrode material with porous core-shell structure of the present invention and its preparation method.

[0073] (1) 5g polyvinylpyrrolidone (purchased from Sinopharm Group Chemical Reagent Co., Ltd. K-30 brand) is added to the aqueous solution of cobalt chloride and stannous sulfate (300g, wherein, the content of cobalt chloride is 1.8% by weight, sulfuric acid The content of stannous is 4.8% by weight), after stirring the solvent, add the nano-calcium carbonate particle (particle diameter is 50nm, purchased from Shenzhen Puli Chemical Materials Co., Ltd., hereinafter the same) and 50g of spherical graphite particle (particle diameter is 50nm) of 1g 11 μm, purchased from Qingdao Taihelong New Energy Materials Co., Ltd. NG_21 grade), and put the mixture into a nodular ink tank (using a zirconium ball with a diameter of 10 mm) and ball mill it at a speed of 50 rpm for 1 hour to obtain a dispersion; use a metering pump to di...

Embodiment 2

[0078] This example is used to illustrate the negative electrode material with porous core-shell structure of the present invention and its preparation method.

[0079] According to the method described in embodiment 1, the difference is:

[0080] The consumption of calcium carbonate is 0.5g in the step (1);

[0081] In step (2), the high-temperature coal tar pitch was replaced with 15 g of glucose, and naphthalene was replaced with 200 mL of deionized water, and 0.3 g of carbon nanotubes (purchased from Tiannai Material Technology Co., Ltd. LB200 brand) were added;

[0082] In the second heating stage in step (3), the temperature can be raised to 750° C. at a rate of 10° C. / min.

[0083] Thus, the negative electrode material CA2 with a porous core-shell structure is obtained. The particle size of the negative electrode material is D50 of 11.8 μm, the porosity is 8%, the pore diameter is 80nm, the thickness of the carbon shell layer is 1.2 μm, and the weight ratio of carbon ...

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Abstract

The invention relates to a porous core-shell structure negative electrode material. The porous core-shell structure negative electrode material comprises a core layer formed by at least one carbonaceous material of graphite, hard carbon and soft carbon and a carbon shell layer coating the core layer, wherein the carbon shell layer contains amorphous carbon cobalt element and tin element, and has a porous structure with porosity of more than 10%. The invention also discloses a preparation method of the porous core-shell structure negative electrode material, and a battery with the negative electrode containing the porous core-shell structure negative electrode material. The porous core-shell structure negative electrode material provided by the invention can overcome the volume expansion problem in the charge-discharge process, and accordingly through use of the negative electrode formed by the porous core-shell structure negative electrode material provided by the invention, the obtained battery can have good cycle performance.

Description

technical field [0001] The invention relates to a negative electrode material with a porous core-shell structure, a preparation method thereof and a battery. Background technique [0002] In the prior art, a composite of mesoporous carbon spheres and tin-cobalt is prepared by mixing tin-cobalt with an organic carbon source. The preparation method includes: adding the tin source solution to the cobalt source solution dropwise, and preparing a precursor material by solution precipitation; The precursor material is calcined under an inert atmosphere to obtain cobalt stannate nanoparticle clusters; the cobalt stannate nanoparticle clusters are placed in a soluble sugar solution, and carbon-coated cobalt stannate nanoparticle clusters are prepared by hydrothermal carbon coating; The carbon-coated cobalt stannate nanoparticle group is calcined under an inert atmosphere to obtain a carbon-coated cobalt stannate nanoparticle group with a mesoporous structure. [0003] The mesoporou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCH01M4/366H01M4/5835H01M10/0525H01M4/587H01M4/625H01M4/583H01M4/387H01M4/52Y02E60/10H01M10/052H01M2004/021H01M2004/027
Inventor 张开刘会权
Owner BYD CO LTD
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